2009-03-17 14:20:58 -04:00
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dnl $Id$
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2009-03-15 20:08:31 -04:00
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dnl * Check if the compiler understands a certain flag or not.
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dnl Inspiration for this came from watching TagLib configure.
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dnl * Check for the CFLAG required to turn warnings into errors.
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dnl Copyright (c) 2008 Moritz Grimm <mgrimm@mrsserver.net>
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dnl
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dnl Permission to use, copy, modify, and distribute this software for any
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dnl purpose with or without fee is hereby granted, provided that the above
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dnl copyright notice and this permission notice appear in all copies.
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dnl
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dnl THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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dnl WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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dnl MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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dnl ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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dnl WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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dnl ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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dnl OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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dnl AX_CHECK_CFLAG(CFLAG, [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
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dnl AX_CHECK_CXXFLAG(CXXFLAG, [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
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AC_DEFUN([AX_CHECK_CFLAG],
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[
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AC_MSG_CHECKING([if ${CC} understands -$1])
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_cv_sufx_=$(echo $1 | sed 'y|-+,= |_p___|')
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AC_CACHE_VAL([local_cv_prog_cc_${_cv_sufx_}],
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[
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AC_LANG_PUSH([C])
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save_CFLAGS="${CFLAGS}"
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CFLAGS="${CFLAGS} -$1"
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AC_TRY_LINK([], [],
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[eval "local_cv_prog_cc_${_cv_sufx_}=yes"],
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[eval "local_cv_prog_cc_${_cv_sufx_}=no"])
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CFLAGS="${save_CFLAGS}"
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AC_LANG_POP([C])
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])
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eval "_cache_val_=\${local_cv_prog_cc_${_cv_sufx_}}"
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if test x"${_cache_val_}" = "xyes"; then
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AC_MSG_RESULT([yes])
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:
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$2
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else
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AC_MSG_RESULT([no])
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:
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$3
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fi
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])
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AC_DEFUN([AX_CHECK_CXXFLAG],
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[
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AC_MSG_CHECKING([if ${CXX} understands -$1])
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_cv_sufx_=$(echo $1 | sed 'y|-+,= |_p___|')
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AC_CACHE_VAL([local_cv_prog_cxx_${_cv_sufx_}],
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[
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AC_LANG_PUSH([C++])
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save_CXXFLAGS="${CXXFLAGS}"
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CXXFLAGS="${CXXFLAGS} -$1"
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AC_TRY_LINK([], [],
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[eval "local_cv_prog_cxx_${_cv_sufx_}=yes"],
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[eval "local_cv_prog_cxx_${_cv_sufx_}=no"])
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CXXFLAGS="${save_CXXFLAGS}"
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AC_LANG_POP([C++])
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])
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eval "_cache_val_=\${local_cv_prog_cxx_${_cv_sufx_}}"
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if test x"${_cache_val_}" = "xyes"; then
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AC_MSG_RESULT([yes])
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:
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$2
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else
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AC_MSG_RESULT([no])
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:
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$3
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fi
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])
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AC_DEFUN([AX_CHECK_ERROR_FLAG],
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[
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AC_CACHE_VAL([local_cv_prog_cc_error_flag],
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[
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AC_MSG_CHECKING([if ${CC} supports an error flag])
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AC_LANG_PUSH([C])
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save_CFLAGS="${CFLAGS}"
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CFLAGS="${CFLAGS} -Werror"
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AC_TRY_LINK([], [],
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[local_cv_prog_cc_error_flag=-Werror],
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[local_cv_prog_cc_error_flag=no])
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CFLAGS="${save_CFLAGS}"
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AC_LANG_POP([C])
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if test x"${local_cv_prog_cc_error_flag}" != "xno"; then
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AC_MSG_RESULT([yes (${local_cv_prog_cc_error_flag})])
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:
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$2
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else
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AC_MSG_RESULT([no])
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:
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$3
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fi
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])
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])
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